<!DOCTYPE html>
<html lang="zh-CN">
    <head>
        <meta charset="UTF-8" />
        <title>19_文本属性-背景属性-背景颜色</title>
        <style>

            /* body {
                background-color: gray;
            } */

            div {
                width: 300px;
                height: 300px;
                border: 1px solid black;
                /* background-color: yellowgreen; */
            }
        </style>
    </head>
    <body>
        <div>
            你好
        </div>
    </body>
</html>